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Total 27 documents matching your query.

1. [Amps] HV Switch Mode Power Supplies (score: 1): Author: "DUGAS, JASON A. (JSC-EP) (NASA)" <jason.a.dugas@nasa.gov>; Date: Tue, 21 Jun 2005 15:07:19 -0500; I have seen very little discussion in the amateur community for HV Switch Mode Power supplies in conjunction with RF amplifiers. With the increased difficulty of finding 60Hz 2400VAC transformers as; /archives//html/Amps/2005-06/msg00170.html (6,717 bytes)
2. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: John Irwin <crazytvjohn@yahoo.com>; Date: Tue, 21 Jun 2005 16:37:30 -0700 (PDT); Hi Be advised that some Panasonic microwave in the late 90' used switch mode power supplies and were light as a feather. Find one in the junk and check it out. They are at about 2300vdc give or take; /archives//html/Amps/2005-06/msg00171.html (7,345 bytes)
3. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Tue, 21 Jun 2005 17:55:58 -0700; I have a small 120 kV X-ray supply that needs 1 kHz 240 V input. I can get the 240 from the dryer outlet, but how do I design a 1 kHz switcher if I don't know the specific details of the transformer?; /archives//html/Amps/2005-06/msg00172.html (6,591 bytes)
4. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Wed, 22 Jun 2005 09:59:11 +0100; There was a design for one several years ago in QEX (the ARRL's technical journal). There are also some corrections to it. I can't recall the power rating, but it was about 2 kW - too small for what; /archives//html/Amps/2005-06/msg00173.html (9,183 bytes)
5. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 22 Jun 2005 09:04:05 -0400; You can go to wallmart and get a Panasonic "Inverter" microwave oven for about $60. It contains a 1500 watt SMP. But there are a few problems: 1. The output is negative around 4 or 5 Kv and very unre; /archives//html/Amps/2005-06/msg00174.html (10,151 bytes)
6. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 22 Jun 2005 09:33:27 -0700; I would add to Bill's list of problems the fact that the things are terrible HF hash generators. We bought one. It works. The new rule is "Absolutely no microwave use while Grumps is on the radio!" I; /archives//html/Amps/2005-06/msg00175.html (7,754 bytes)
7. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 22 Jun 2005 14:06:16 -0400; If it is off while receiving what difference would it make. 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li; /archives//html/Amps/2005-06/msg00177.html (8,906 bytes)
8. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 22 Jun 2005 14:09:34 -0400; I'd assume that the power supply would be put into a box with line filters and DC filters as well. You want to make sure that there is no 40 KHz switching noise on the HV to the amplifier because it; /archives//html/Amps/2005-06/msg00178.html (9,256 bytes)
9. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Wed, 22 Jun 2005 13:14:02 -0700; We have one of the mentioned Panasonic microwave ovens and it is *impossible* to use our 2.4ghz (no surprise here) cordless telephone when it is in use. Discovered this when one of our callers said t; /archives//html/Amps/2005-06/msg00181.html (9,390 bytes)
10. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: "wc6w@juno.com" <wc6w@juno.com>; Date: Thu, 23 Jun 2005 00:55:06 GMT; Hi Jason, This topic seems to pop up here every couple years. Unless weight (or size?) is THE important factor there is probably no other sound reason to employ a SPS when one considers the added com; /archives//html/Amps/2005-06/msg00186.html (9,056 bytes)
11. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: "Iezzi Family" <slifamily@earthlink.net>; Date: Wed, 22 Jun 2005 21:03:33 -0400; The primary side of a typical High Voltage AC/DC SMPS would be typical of any other off-line converter. The secondary side could be implemented with simple diode rectfication and a divider for the f; /archives//html/Amps/2005-06/msg00188.html (10,539 bytes)
12. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: "Winfried Kriegl" <dk9ip@gmx.de>; Date: Thu, 23 Jun 2005 09:02:20 +0200 (MEST); http://www.wattsunlimited.com have a 2500W SMPS. Works fine. 73 Win DK9IP/KH7CD -- Geschenkt: 3 Monate GMX ProMail gratis + 3 Ausgaben stern gratis ++ Jetzt anmelden & testen ++ http://www.gmx.net/de; /archives//html/Amps/2005-06/msg00192.html (9,289 bytes)
13. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 23 Jun 2005 09:45:00 +0100; Looks very nice. Do you know if it is/can be 'CE' marked? Thanks, Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi; /archives//html/Amps/2005-06/msg00193.html (8,258 bytes)
14. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Fri, 24 Jun 2005 00:39:13 +0100; But look at the regulation (or lack of). http://wattsunlimited.com/_wsn/page3.html -- David Kirkby, G8WRB Please check out http://www.g8wrb.org/ of if you live in Essex http://www.southminster-branch; /archives//html/Amps/2005-06/msg00214.html (9,038 bytes)
15. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sat, 25 Jun 2005 01:16:56 +0100; I would have thought that cause serious non-linearity problems on SSB. Having gone to a switch mode design, I would have thought they used some feedback to keep the voltage constant. But it seems not; /archives//html/Amps/2005-06/msg00221.html (10,986 bytes)
16. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Fri, 24 Jun 2005 19:42:55 -0500; David, I was going for 1000 V, and was thinking 1 kV so must have added it and didn't catch it. The graph on the website showed a 1000 V drop over the range of 0-1 ampere. About every power supply I'; /archives//html/Amps/2005-06/msg00222.html (12,317 bytes)
17. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 24 Jun 2005 20:13:38 -0700; Correct, but most of the switcher supplies that I've seen have a feedback loop that maintains output V with changes in load-I. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _________________; /archives//html/Amps/2005-06/msg00223.html (13,473 bytes)
18. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Harry Brown <harryhbrown@earthlink.net>; Date: Sat, 25 Jun 2005 07:34:30 -0400; Here's some more info on a "real" application of the Watts Unlimited power supply. At the VHF Dinner at Dayton this year, K5AND gave a talk on a 6 Meter amp he designed using an 8877 for DXpedition p; /archives//html/Amps/2005-06/msg00227.html (12,540 bytes)
19. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sat, 25 Jun 2005 16:41:32 +0100; Did he make measurements of IMD? I'm surprised the amp did not weigh more than that, but anyway, that is not the main issue. The graph of regulation (which does not state if this is typical, or guara; /archives//html/Amps/2005-06/msg00230.html (15,079 bytes)
20. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sat, 25 Jun 2005 11:22:02 -0500; Hi, David-- Just FYI. Watts Unlimited is owned by W9QQ who has a PhD in electrical engineering and has designed many SMPSs. Granted, this design is a "gutless wonder" and it bears no resemblance to; /archives//html/Amps/2005-06/msg00231.html (12,538 bytes)

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